Melt the butter in a large saucepan. Blend in flour, salt, and basil. Stir in chicken broth left from boiling chicken. Cook, stirring constantly, until mixture thickens and comes to a boil. Remove from heat, add chicken. Mix cottage cheese with beaten egg. Cook and drain noodles. Lightly grease a 9 x 13 inch baking dish. Place 1/3 of the chicken mixture on bottom of dish. Top with half of noodles, half of cottage cheese mixture, half of spinach and half of mozzarella. Repeat, ending with the last 1/3 of chicken mixture and the Parmesan cheese. Bake for 45 minutes at 375ºF.  Remove from oven and let stand a few minutes before cutting into squares. Makes 10 servings.